How long can l access upgraded Track&Plan project ?

I upgraded my project. but I can access Track&Plan, too. and my project have the following message:

"Your project was upgraded to this toolchain. For a limited time, you can revert the upgrade if needed by deleting the toolchain. After you delete the toolchain, you can upgrade your project to a toolchain again. If you encounter any problems, contact us at hub@jazz.net."

"For a limited time" exactly when is it ? When will the upgraded project be deleted? End of Support Date: July 5, 2017 ?